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Let’s think about this for a minute. We’ve got a bacterial brew at the hatchery: thousands of birds in close proximity swapping bacteria while feces piles mount beneath them. At the slaughterhouse, we’ve got workers working rapidly to disembowel and dismember those very birds along fast-moving conveyor belts. The latter conditions seem perfect for infecting workers with MRSA.

Wal-Mart’s sheer size has long enabled it to create ripple effects throughout corporate America whenever it adopts new ways of doing business.

For instance, Len Sauers, the vice president for global sustainability at Procter & Gamble, recalls that a few years ago, when his company and a few others began selling concentrated laundry detergent that uses 50 percent less water — and allows for a smaller container using less plastic — that version was slow to catch on.

In 2007, Wal-Mart decided it would sell only the concentrated detergents.

“Because of Wal-Mart’s leadership in that area, they were able to set a standard for the entire industry,” Mr. Sauers said. “That opened the door to allow it to progress very, very quickly.”